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<title>H8/300 Options (Using the GNU Compiler Collection (GCC))</title>

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<h4 class="subsection" id="H8_002f300-Options-1"><span>3.19.18 H8/300 Options<a class="copiable-link" href="#H8_002f300-Options-1"> &para;</a></span></h4>

<p>These &lsquo;<samp class="samp">-m</samp>&rsquo; options are defined for the H8/300 implementations:
</p>
<dl class="table">
<dt><a id="index-mrelax-1"></a><span><code class="code">-mrelax</code><a class="copiable-link" href="#index-mrelax-1"> &para;</a></span></dt>
<dd><p>Shorten some address references at link time, when possible; uses the
linker option <samp class="option">-relax</samp>.  See <a data-manual="ld" href="https://sourceware.org/binutils/docs/ld/H8_002f300.html#H8_002f300"><code class="code">ld</code> and the H8/300</a> in <cite class="cite">Using ld</cite>, for a fuller description.
</p>
</dd>
<dt><a id="index-mh"></a><span><code class="code">-mh</code><a class="copiable-link" href="#index-mh"> &para;</a></span></dt>
<dd><p>Generate code for the H8/300H.
</p>
</dd>
<dt><a id="index-ms"></a><span><code class="code">-ms</code><a class="copiable-link" href="#index-ms"> &para;</a></span></dt>
<dd><p>Generate code for the H8S.
</p>
</dd>
<dt><a id="index-mn"></a><span><code class="code">-mn</code><a class="copiable-link" href="#index-mn"> &para;</a></span></dt>
<dd><p>Generate code for the H8S and H8/300H in the normal mode.  This switch
must be used either with <samp class="option">-mh</samp> or <samp class="option">-ms</samp>.
</p>
</dd>
<dt><a id="index-ms2600"></a><span><code class="code">-ms2600</code><a class="copiable-link" href="#index-ms2600"> &para;</a></span></dt>
<dd><p>Generate code for the H8S/2600.  This switch must be used with <samp class="option">-ms</samp>.
</p>
</dd>
<dt><a id="index-mexr"></a><span><code class="code">-mexr</code><a class="copiable-link" href="#index-mexr"> &para;</a></span></dt>
<dd><p>Extended registers are stored on stack before execution of function
with monitor attribute. Default option is <samp class="option">-mexr</samp>.
This option is valid only for H8S targets.
</p>
</dd>
<dt><a class="index-entry-id" id="index-mexr-1"></a>
<a id="index-mno_002dexr"></a><span><code class="code">-mno-exr</code><a class="copiable-link" href="#index-mno_002dexr"> &para;</a></span></dt>
<dd><p>Extended registers are not stored on stack before execution of function 
with monitor attribute. Default option is <samp class="option">-mno-exr</samp>. 
This option is valid only for H8S targets.
</p>
</dd>
<dt><a id="index-mint32"></a><span><code class="code">-mint32</code><a class="copiable-link" href="#index-mint32"> &para;</a></span></dt>
<dd><p>Make <code class="code">int</code> data 32 bits by default.
</p>
</dd>
<dt><a id="index-malign_002d300"></a><span><code class="code">-malign-300</code><a class="copiable-link" href="#index-malign_002d300"> &para;</a></span></dt>
<dd><p>On the H8/300H and H8S, use the same alignment rules as for the H8/300.
The default for the H8/300H and H8S is to align longs and floats on
4-byte boundaries.
<samp class="option">-malign-300</samp> causes them to be aligned on 2-byte boundaries.
This option has no effect on the H8/300.
</p></dd>
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